Nissens 999221 A/C Expansion Valve

Nissens A/C Expansion Valve for BMW HVAC Service

The Nissens 999221 A/C expansion valve is a block-style refrigerant flow control component for BMW air conditioning systems. Built from aluminum and supplied with O-rings, it is specified for R134A applications and supports precise refrigerant metering in the HVAC circuit.

Key Features

• Block-style A/C expansion valve for BMW HVAC systems
• Aluminum construction for durable service in the refrigerant circuit
• Designed for R134A refrigerant
• O-rings included for sealing at the connection points
• Liquid inlet thread diameter: 0.5500
• Liquid outlet thread diameter: 0.5900
• Suction inlet thread diameter: 0.7100
• Suction outlet thread diameter: 0.7100
• Cross-references Four Seasons 39399 and UAC EX10304C for the same application

Detailed Description

Nissens part number 999221 is an A/C expansion valve used to regulate refrigerant flow through the evaporator circuit, helping maintain proper system pressure balance and cooling performance. This block-type valve is built for BMW applications that use R134A refrigerant, including 2006-2016 BMW X1, X3, X4, 128i, 135i, 328i, 328i xDrive, 335i, 335i xDrive, 335is, 335d, 328xi, 335xi, 325i, 325xi, 330xi, 1 Series M, and M3 coverage listed below. Nissens 999221 is part of the brand’s thermal management range, produced to meet the same quality standards across its aftermarket catalog.

What It Helps Address

• Weak or inconsistent cabin cooling
• Improper refrigerant metering at the evaporator
• Pressure imbalance in the A/C circuit
• Leaking valve connections at the refrigerant ports
• Service replacement for a worn BMW expansion valve

Installation Notes and Tips

• Verify refrigerant type before installation; this valve is specified for R134A systems.
• Confirm port dimensions and block-style configuration against the original part.
• Replace and lubricate the included O-rings during assembly.
• Evacuate and recharge the system according to BMW HVAC service procedures after installation.
• Check the evaporator, compressor, and lines for contamination or leaks before returning the vehicle to service.

Quality Assurance

Nissens develops and manufactures thermal management components for the aftermarket with a focus on consistent fit and function. Part number 999221 reflects that product approach for BMW A/C service work, including BMW X3, BMW X4, and BMW 328i applications.

BMW Fitment

• Fits 2016 BMW X3, N/A, to 04/2016
• Fits 2016 BMW X4, N/A, to 04/2016
• Fits 2013-2015 BMW X1, N/A
• Fits 2011-2015 BMW X3, N/A
• Fits 2015 BMW X4, N/A
• Fits 2008-2013 BMW 128i, N/A
• Fits 2008-2013 BMW 135i, N/A
• Fits 2007-2013 BMW 328i, N/A
• Fits 2009-2013 BMW 328i xDrive, N/A
• Fits 2012-2013 BMW 335i, N/A, Exc.Sedan
• Fits 2013 BMW 335i xDrive, N/A, Exc.Sedan
• Fits 2011-2013 BMW 335is, N/A
• Fits 2008-2013 BMW M3, N/A
• Fits 2009-2012 BMW 335i xDrive, N/A
• Fits 2012 BMW X1, N/A, Inlet 1: 35mm, Inlet 2: 28.8 mm, Outlet 1: 15.3 mm, Outlet 2: 18 mm
• Fits 2011 BMW 1 Series M, N/A, to 03/2010
• Fits 2011 BMW 1 Series M, N/A, from 03/2010
• Fits 2009-2011 BMW 335d, N/A
• Fits 2007-2011 BMW 335i, N/A
• Fits 2007-2008 BMW 328xi, N/A
• Fits 2007-2008 BMW 335xi, N/A
• Fits 2006 BMW 325i, N/A
• Fits 2006 BMW 325xi, N/A
• Fits 2006 BMW 330xi, N/A